<!--
 * @Author: 胡海
 * @Date: 2020-08-29 13:09:51
 * @LastEditors: 胡海
 * @LastEditTime: 2020-09-11 16:18:59
 * @Description: 
--><template>
  <div class="goods">
    <div class="menu-wrapper" v-el:menu-wrapper>
      <ul>
        <li v-for="item in goods" class="menu-item" :class="{'current':currentIndex===$index}"
            @click="selectMenu($index,$event)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" v-el:foods-wrapper>
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li @click="selectFood(food,$event)" v-for="food in item.foods" class="food-item border-1px">
              <div class="icon">
                <img width="57" height="57" :src="food.icon">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart v-ref:shopcart :select-foods="selectFoods" :delivery-price="seller.deliveryPrice"
              :min-price="seller.minPrice"></shopcart>
  </div>
  <food :food="selectedFood" v-ref:food></food>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import shopcart from 'components/shopcart/shopcart';
  import cartcontrol from 'components/cartcontrol/cartcontrol';
  import food from 'components/food/food';
  const ERR_OK = 0
    export default {
      props: {
       seller: {
        type: Object
    }
  },
  data() {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    };
  },
  computed: {
    currentIndex() {
      for (let i = 0; i < this.listHeight.length; i++){
        let height1 = this.listHeight[i];
        let height2 = this.listHeight[i + 1];
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i;
        }
      }
      return 0;
    },
    selectedFoods() {
      let foods = [];
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
           if (food.count) {
             foods.push(food);
           }
        });
      });
      return foods;
    }
    },
  created() {
    this.classMap = ['decrease','discount','special','invoice','gurantee']; 
    this.$http.get('/api/goods').then((response) => {
      response = response.body;
      if( response.errno === ERR_OK) {
        this.goods = response.data;
        this.$nextTick(() => {
          this._initScroll();
          this._calculateHeight();
        });
      }
    });
  },
  methods: {
    selectMenu(index, event) {
      if (!event._constructed) {
        return;
      }
      let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook');
      let el = foodList[index];
      this.foodsScroll.scrollToElement(el, 300);
    },
    selectFood(food,event) {
      if (!event._constructed) {
        return;
      }
      this.selectedFood = food;
      this.$refs.food.show();
    },
    _drop(target) {
     this.$nextTick(() => {
        this.$refs.shopcart.drop(target);
     });
    },
    _initScroll() {
      this.menuScroll = new BScroll(this.$els.menuWrapper,{
        click: true
      });
      this.foodsScroll = new BScroll(this.$els.foodsWrapper,{
        click: true,
        probeType: 3
      });

      this.foodsScroll.on('scroll' , (pos) => {
        this.scrollY = Math.abs(Math.round(pos.y));
      });
    },
    _calculateHeight() {
       let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook');
       let height = 0;
       this.listHeight.push(height);
       for(let i = 0; i < foodList.length; i++){
         let item = foodList[i];
         height += item.clientHeight;
         this.listHeight.push(height);
       }
    }
  },
  components: {
     shopcart,
     cartcontrol,
     food
  },
  events: {
    'cart.add'(target) {
      this._drop(target);
    }
  }
  
};
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin";
  .goods
    display: flex 
    position: absolute
    top: 174px 
    bottom: 46px 
    width: 100% 
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px 
      width: 80px 
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px 
        width: 56px
        padding: 0 12px   
        line-height: 14px 
        &.current
          position: relative
          z-index: 10
          margin-top: -1px 
          background: #fff 
          font-weight: 700  
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align :top
          width :12px
          height :12px
          margin-right :2px
          background-size :12px 12px
          background-repeat :no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee 
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display: table-cell
          width: 56px 
          vertical-align: middle
          border-1px(rgb(7, 17, 27, 0.1))
          font-size: 12px  
  .foods-wrapper
      flex: 1
      .title
         padding-left: 14px 
         height: 26px 
         line-height: 26px 
         border-left: 2px solid #d9dde1
         font-size: 12px
         color: rgb(147, 153, 159)
         background: #f3f5f7
      .food-item
        display: flex
        margin: 18px 
        padding-bottom: 18px
        border-1px(rgba(7, 17, 27, 0.1))     
        &:last-child
          border-none()
          margin-bottom: 0 
        .icon
          flex: 0 0 57px 
          margin-right: 10px 
        .content
          flex: 1 
        .name
          margin: 2px 0 8px 0 
          height: 14px 
          font-size: 14px 
          color: rgb(7, 17, 27)
        .desc, .extra 
          line-height: 10px 
          font-size: 10px 
          color: rgb(147, 153, 159)
        .desc
          line-height: 12px 
          margin-bottom: 8px 
        .extra
          .count
            margin-right: 12px 
        .price 
          font-weight: 700
          line-height: 24px 
          .now
            margin-right: 8px 
            font-size: 14px  
            color: rgb(240, 20, 20)
          .old
            text-decoration: line-through
            font-size: 10px 
            color: rgb(147, 153, 159)    
        .cartcontrol-wrapper
          position: absolute 
          right: 0
          bottom: 12px            
</style>